Antonyms of adj fruitless

1 sense of fruitless

Sense 1
bootless, fruitless, futile, sleeveless, vain -- (unproductive of success; "a fruitless search"; "futile years after her artistic peak"; "a sleeveless errand"; "a vain attempt")

INDIRECT (VIA unproductive) -> productive -- (producing or capable of producing (especially abundantly); "productive farmland"; "his productive years"; "a productive collaboration")

Similarity of adj fruitless

1 sense of fruitless

Sense 1
bootless, fruitless, futile, sleeveless, vain -- (unproductive of success; "a fruitless search"; "futile years after her artistic peak"; "a sleeveless errand"; "a vain attempt")
       => unproductive (vs. productive) -- (not producing or capable of producing; "elimination of high-cost or unproductive industries")